Estimation of plasma parameters in a pre-breakdown ionization wave at the glow discharge ignition in argon

This paper investigates the characteristics some of argon plasma parameters of glow discharge under axial magnetic field. The DC power supply of range (0-6000) V is used as a breakdown voltage to obtain the discharge of argon gas. The discharge voltage-current (V-I) characteristic curves and Paschen’s curves as well as the electrical conductivity were studied with the presents of magnetic field confinement at different gas pressures. The magnetic field up to 25 mT was obtained using four coils of radius 6 cm and 320 turn by passing A.C current up to 5 Amperes. Spectroscopic measurements are employed for purpose of estimating two main plasma parameters electron temperature (Te) and electron density (ne). Emission spectra from positive column (PC) zone of the discharge have been studies at different values of magnetic field and pressures at constant discharge currents of 1.5 mA. Electron temperature (Te) and its density are calculated from the ratio of the intensity of two emission lines of the same lower energy levels. Experimental results show the abnormal glow region characteristics (positive resistance). Breakdown voltage versus pressure curves near the curves of paschen and decrease as magnetic field increases due to magnetic field confinement of plasma charged particles. Also the electrical conductivity increases due to enhancing magnetic field at different gas pressures. Both temperature density of electron and the intensities of two selected emission lines decrease with increasing pressure due decreasing of mean free path of electron. Electron density increase according to enhancing magnetic field, while the intensity of emitting lines tends to decrease.

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Features of glow discharge ignition through a small hole in the hollow cathode of a large volume

Journal of Physics Conference Series ◽

10.1088/1742-6596/2064/1/012118 ◽

2021 ◽

Vol 2064 (1) ◽

pp. 012118

Author(s):

A S Klimov ◽

I Y Bakeev ◽

A A Zenin

Keyword(s):

Glow Discharge ◽

Large Volume ◽

Hollow Cathode ◽

Pressure Range ◽

Threshold Current ◽

Small Hole ◽

Discharge System ◽

Discharge Ignition ◽

Burning Mode

Abstract The influence of the size of a cathode gap on the initiation of the effect of a hollow cathode in a glow discharge system with an extended hollow cathode in the forevacuum pressure range is shown. It was found that the threshold current for the transition of the discharge to the burning mode with a hollow cathode is determined by the ratio of the longitudinal and transverse dimensions of the cathode slit. With a decrease in the width of the slot, the threshold current increases disproportionately; at the same time, with an increase in the length of the slot, this current sharply decreases.

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Effect of Pressure and Hot Filament Cathode on Some Plasma Parameters of Hollow Anode Argon Glow Discharge Plasma

American Journal of Modern Physics ◽

10.11648/j.ajmp.20160503.12 ◽

2016 ◽

Vol 5 (3) ◽

pp. 30 ◽

Cited By ~ 1

Author(s):

Sh. Kh. Al-Hakary

Keyword(s):

Glow Discharge ◽

Discharge Plasma ◽

Glow Discharge Plasma ◽

Plasma Parameters ◽

Effect Of Pressure ◽

Hollow Anode ◽

Hot Filament

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THE COMPOSITION OF THE POSITIVE COLUMN OF A HELIUM GLOW DISCHARGE AT INTERMEDIATE PRESSURES

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1979762 ◽

1979 ◽

Vol 40 (C7) ◽

pp. C7-127-C7-128

Author(s):

F. Dothan ◽

Yu. M. Kagan

Keyword(s):

Glow Discharge ◽

Differential Equations ◽

Positive Column ◽

Molecular Ions ◽

Time Change ◽

The Other ◽

System Of Differential Equations ◽

Plasma Parameters ◽

Electron Collisions

The concentration of atomic and molecular ions and metastables is investigated for the positive column of a helium glow discharge. Recently (1,2) the system of differential equations for the helium afterglow describing the time change of these plasma parameters was written and solved. In the stationary positive column we can neglect some processes which are importent in the afterglow. On the other side we must take into account processes of excitation and ionization by electron collisions which can be neglected in the afterglow.

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